I am a newbie on Flash and really need some guidance or a source code to work off of. I need a flash player that I can have two videos, overlayed with a mask at 50% on each so I see half of one video on the right and half of the other video on the left, thus split screen.

We are trying to show off the same video with a before and after effect or show processed video on one side and non-processed video on the other.

If anyone has a sample or knows how to do this, I would be interested in talking with them.

why transparency? the left side of the finished presentation would show the left 1/2 of the video (the before or after) and the right side would show the right 1/2 of the video (the after or before). i can't envision any part that would show partial tranparency and be helpful to your presentation.

I don't need 50% transparency or 50% alpha, just need the right half only of one video and the left half of the other. Just need to mask 50% of the first video, etc. I'm sorry I am not explaining this very well.